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 Lh9vhWbo 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Oct 09, 2024 at 02:44:30PM +0800, Oliver Sang wrote: > hi, Lorenzo, > > On Tue, Oct 08, 2024 at 09:44:24AM +0100, Lorenzo Stoakes wrote: > > On Tue, Oct 08, 2024 at 04:31:59PM +0800, Oliver Sang wrote: > > > hi, Lorenzo Stoakes, > > > > > > sorry for late, we are in holidays last week. > > > > > > On Mon, Sep 30, 2024 at 09:21:52AM +0100, Lorenzo Stoakes wrote: > > > > On Mon, Sep 30, 2024 at 10:21:27AM GMT, kernel test robot wrote: > > > > > > > > > > > > > > > Hello, > > > > > > > > > > kernel test robot noticed a -5.0% regression of aim9.brk_test.ops_per_sec on: > > > > > > > > > > > > > > > commit: cacded5e42b9609b07b22d80c10f0076d439f7d1 ("mm: avoid using vma_merge() for new VMAs") > > > > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > > > > > > > testcase: aim9 > > > > > test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (Ivy Bridge-EP) with 64G memory > > > > > > > > Hm, quite an old microarchitecture no? > > > > > > > > Would it be possible to try this on a range of uarch's, especially more > > > > recent noes, with some repeated runs to rule out statistical noise? Much > > > > appreciated! > > > > > > we run this test on below platforms, and observed similar regression. > > > one thing I want to mention is for performance tests, we run one commit at least > > > 6 times. for this aim9 test, the data is quite stable, so there is no %stddev > > > value in our table. we won't show this value if it's <2% > > > > Thanks, though I do suggest going forward it's worth adding the number even > > if it's <2% or highlighting that, I found that quite misleading. > > > > Also might I suggest reporting the most recent uarch first? As this seeming > > to be ivy bridge only delayed my responding to this > > we have 80+ testsuite but a reletively small machine pool (due to resource > constraint), the recent uarch machines are used mostly for more popular > testsuites or those easy for us to catch regression per our experience. > > unfortunately, the aim9 is only allot to Ivy Bridge as regular tests now. > the data on other platforms I shared with you in last thread are from manual > runs. sorry if this causes any inconvenience. Understood, sorry I realise you are providing this service for free and again to reiterate - I'm hugely grateful and glad you helped spot this problem which I will now address! :) > > > (not to sound > > ungrateful for the report, which is very useful, but it'd be great if you > > guys could test in -next, as this was there for weeks with no apparent > > issues). > > we don't test a single tree, instead, we merged a lot of trees together to > so-called hourly kernel and test upon it. mainline is stable and is our merge > base for lots of hourly kernels, so it has big chance to be tested and bisect > successfully. -next could also be the merge base some time, but since it's > rebased frequently, hard for us to finish test and bisect in time, some time > we even cannot use it as merge base since various issues. it's really a pity > that we miss issues on -next ... Sure and I guess from my perspective it can be easy to underestimate the combinatorial explosion of that. It'd obviously be a nice-to-have for you to be able to take into account -next but absolutely get it! :) > > > > > I will look into this now, if I provide patches would you be able to test > > them using the same boxes? It'd be much appreciated! > > sure! that's our pleasure! Perfect, thanks very much! > > > > > Thanks, Lorenzo > >